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<script>
    // ++,--的使用
    let a = 10
    // a++  // a = a + 1----a+=1
    // ++a  // a = a + 1----a+=1
    // console.log(a)

    // console.log(--a)
    // console.log(++a)
    // console.log(++a)
    // console.log(a++)
    // console.log("a1:", a--)
    // console.log("a2:", a)

    for (let i = 0; i < 5; i++) {
        console.log(i);
    }

</script>
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